The University of Florida's IFAS Extension recommends an acid-forming fertilizer with a 12-4-8 NPK ratio for azaleas in Florida's sandy soils, and while no specific "IFAS-branded" product exists, you can find a suitable Scotts Continuous Release Plant Food with that ratio.

IFAS Recommendations

The UF/IFAS Extension service specifically recommends using an acid-forming fertilizer with a 12-4-8 or 15-5-15 NPK ratio for azaleas in Florida's sandy soils. They advise frequent, light applications of fertilizer seasonally (spring, summer, fall, and winter) at a rate of approximately ¼ pound for a mature plant or ¾ to 1½ pounds per 100 square feet. Complete fertilizers containing essential micronutrients are also recommended.

Recommended Products (12-4-8 NPK)

While specific azalea/camellia/rhododendron products often have different NPK ratios like 30-10-10 (Miracle-Gro) or 5-4-3 (True Organic), the following product matches the 12-4-8 ratio recommended by IFAS for general use:

Key Takeaways

• The 12-4-8 ratio is a nitrogen-heavy formula intended for general, strong growth, particularly in sandy soils that may not retain nutrients well.
• Other fertilizers like 6-10-4 or 10-20-10 shift the focus to flowering and root development by having a higher middle number (phosphorus).
• The most important factor is using an acid-forming fertilizer and following soil test recommendations to ensure the plants get the correct overall nutrient balance and maintain the proper soil pH.

Based on UF/IFAS (University of Florida/Institute of Food and Agricultural Sciences) recommendations for 2026, acid-loving plants like azaleas, camellias, and rhododendrons in Florida's sandy soils require specific, frequently applied fertilizers that maintain a low soil pH (4.5 to 6.0) and include micronutrients.

Fertilizer Recommendations (12-4-8 and Alternatives)

• 12-4-8 Acid-Forming Fertilizer: IFAS suggests using acid-forming fertilizers such as 12-4-8 or 15-5-15 to provide necessary nutrients while keeping the soil acidic.
• Other Suitable Ratios: While 12-4-8 is recommended for promoting greening and growth, other suitable formulations for these plants include 10-10-10 or specialized azalea/camellia mixes (e.g., 4-8-5, 4-8-8, or 9-15-13).
• Key Components: The fertilizer should contain iron (to prevent chlorosis/yellowing), sulfur (to lower pH), and other trace elements.

Application Guidelines (2026)

• Frequency: In Florida's sandy soils, apply fertilizer light and frequently during each season—spring, summer, fall, and winter.
• Dosage: Apply approximately ¼ pound to a mature plant or ¾ to 1½ pounds per 100 square feet.
• Placement: Spread granules evenly around the base of the plant within the drip line (branch spread), avoiding direct contact with the stems to prevent damage.
• Watering: Always water thoroughly after application to activate the nutrients.
• Timing: For azaleas, apply fertilizer after they have finished blooming.

Top Recommended Products (Acid-Loving)

• Vigoro All Season Azalea, Camellia & Rhododendron Food (10-8-8): Recommended for promoting blooms and dense root systems.
• Espoma Holly-Tone (4-3-4): An organic option rich in natural organics, frequently recommended for acid-loving plants.
• Fertilome Azalea, Camellia, Rhododendron Food (9-15-13): A balanced formula with trace elements.
• True Organic Azalea, Camellia & Rhododendron Food (5-4-3): Contains sulfur for pH control.
• Miracle-Gro Water Soluble Azalea, Camellia, Rhododendron Food (30-10-10): A fast-release, liquid option for quick results.

• Example Product Features (Based on 2021-2025 info, consistent with IFAS guidance):
  Look for fertilizers listing ingredients like Iron Sucrate, Manganese Sucrate, Zinc Sulfate, Boric Acid, Copper Sulfate, and Sodium Molybdate to get these vital micronutrients.
• When to Apply:
  Follow label directions, typically in early spring after flowering and potentially again in late spring/early summer, avoiding late-season fertilization to prevent frost damage.